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In Flight with United Air Lines, Dot-Dash-Zone - Radio Station

In Flight with United Air Lines, Dot-Dash-Zone - Radio Station
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Stock #: 580818
Type: Postcard
Era: Linen
Publisher: United Air Lines
Size: 3.5" x 5.5" (9 x 14 cm)
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Additional Details:
The directive radio beam is a series of dots and dashes broadcast continuously along the air way. When the pilot hears the steady hum of dashes through his head set (see right), he knows he is following his true course. The planes also have 2-way voice radio, enabling the pilot to talk to United Air Lines' ground stations with other planes in flight.